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This happened to me today on a major highway. The Ford garage told me it is a transmission problem. Check transmission problem solutions here in this blog. Solenoids, etc. It means your transmission is slipping, that happens in a lot of Mercury mystiques. not all true there is a throttle position sensor or T.P.S. on your throttlebody try that its way cheaper than transmission

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โˆ™ 2009-07-17 01:21:02
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Q: Why would the RPM go up and down in a 97 Mercury Mystique?
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